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https://issues.apache.org/jira/browse/GROOVY-9469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17070252#comment-17070252
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Paul King commented on GROOVY-9469:
-----------------------------------
This works up until 2.5.7 but starts failing from 2.5.8.
> Original exception during global AST transformation no longer preserved in
> error message
> ----------------------------------------------------------------------------------------
>
> Key: GROOVY-9469
> URL: https://issues.apache.org/jira/browse/GROOVY-9469
> Project: Groovy
> Issue Type: Bug
> Components: Compiler
> Affects Versions: 3.0.0, 3.0.2
> Reporter: Marcin Zajaczkowski
> Priority: Minor
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Global AST transformation in Spock throws exception with meaningful error
> message if used with incompatible Groovy version (e.g. Spock for Groovy 2.5
> executed with Groovy 2.4):
> {code:java}
> Could not instantiate global transform class
> org.spockframework.compiler.SpockTransform specified at
> jar:file:/.../spock-core-1.3-groovy-2.5.jar!/META-INF/services/org.codehaus.groovy.transform.ASTTransformation
> because of exception
> org.spockframework.util.IncompatibleGroovyVersionException:
> The Spock compiler plugin cannot execute because Spock 1.3.0-groovy-2.5 is
> not compatible
> with Groovy 2.4.3. For more information, see
> http://versioninfo.spockframework.org
> Spock artifact: file:/.../spock-core-1.3-groovy-2.5.jar
> Groovy artifact: file:/.../groovy-2.4.3.jar
> {code}
> However, it stopped working with Spock 2.0 for Groovy 2.5 and Groovy 3.0:
> {code:java}
> Could not instantiate global transform class
> org.spockframework.compiler.SpockTransform specified at
> jar:file:/.../spock-core-2.0-M1-groovy-2.5.jar!/META-INF/services/org.codehaus.groovy.transform.ASTTransformation
> because of exception java.lang.reflect.InvocationTargetException
> {code}
> It's not very constructive for people seeing that error message. Firstly, I
> suspected some incompatibilities in the Spock code which completely fails
> with new Groovy. However, it turned out that the exception is hidden by
> Groovy itself.
> I slightly modified ASTTransformationVisitor it detect that situation and get
> target/cause in a case of InvocationTargetException - my
> [PR|https://github.com/apache/groovy/pull/1193].
> It helped, however, I haven't found any change in the
> ASTTransformationVisitor which could cause that regression. It might to some
> 2.5→3.0 change how constructor are called (e.g. around CachedConstructor
> which is used, but doesn't seem to intercept the exception) or anything else.
> You might want to investigate it - it worked without my tweak in Groovy 2.5.
> Related Spock issues: [https://github.com/spockframework/spock/issues/1067]
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